Sound reproducer for talking motion pictures



Dec. 12, `1933. R. c. BURT 1,938,805

SOUND REPRODUCER FOR TALKING MOTIN PICTURES Filed March 15, 1930. e sheets-sheet l il "uff /N VEA/TOR Dec. 12, 1933.

R. c. BURT 1,938,805

SOUND REPRODUCER FOR TALKING MOTION PICTURES Filed March l5, 1950 6 Sheets-Sheet 2 BY /ZM/v/ ATTORNEY Dec. 12, 1933. R C, BURT 1,938,805

SOUND REPRODUCER FOR TALKING MOTION PICTURES Filed March l5, 1930 6 Sheets-Sheet 3 NVENTOR Dec. 12, 1933. R. c. BURT 1,938,805

SOUND REPRODUCER FOR TALKING MOTION PICTURES Filed March 15,2195() 6 Sheets-Sheet 4 /N VEN .TOR hw ma/r;

R. C. BURT Dec. 12, 1933.

^ SOUND REPRODUCER FOR TALKING MOTION PICTURES Filed March l5, 1930 6 Sheets-Sheet 5 INVENTOR we CEM/ RNEY QN wm NQ Dec. 12, 1933.

Filed March l5, 1950 R. C. BURT `SOUND REPRODUCER FOR TALKING MOTION PICTURES 6 Sheets-Sheet 6 ATTORNEY UNITED STATES PATENT OFFICE SOUND REPRoDUoER Fon TALKING MOTION PICTURES Robert C. Burt, Pasadena, Calif.

Application March 15,

6 Claims.

This invention relates generally to sound reproducing apparatus for talking motion pictures, and more particularly to sound reproducing apparatus designed for synchronous operation with G standard types of motion picture projectors, and adapted to handle sound records of either the sound-on-lm or of the mechanical disk type.

One of the objects of the invention is to provide a simple and compact reproducing unit l which is attachable to a standard silent motion picture projector without the necessity for extensive alterations thereto, and which is easily and quickly installed.

Another object of the invention is to provide l an apparatus which is efficient, reliable, and capable of sound reproduction of the best regularity and tonal quality, yet which is characterized throughout by extreme simplicity, and with an attendant reduction in the usual high initial cost 20 of such equipment.

These and other objects and features of the invention will appear and be more fully understood from the following detailed description of a present preferred embodiment thereof, refer- 'a5 ence for this purpose being had to the accompanying drawings, in which:

Fig. 1 is a perspective view showing the application of my sound reproducer unit to a projector originally designed for silent pictures;

Fig. 2 is a side elevation of the apparatus shown in Fig. 1;

Fig. 3 is a plan view of the reproducer unit, all over lying projector parts being removed;

Fig. 4 is a vertical section taken on line 4--4 of Fig. 3;

Fig. 5 is a vertical section taken on line 5-5 of Fig. 4;

Fig. 6 is a vertical section taken on the broken line 6-6 of Fig. 4;

Fig. 7 is a vertical section taken on line 7-7 of Fig. 4;

Fig. 8 is a horizontal transverse section taken on line 8--8 of Fig. 7;

Fig. 9 is a perspective View of the optical device embodied in the reproducer unit;

Fig. 10 is a side elevation of the optical device shifted to operative position;

Fig. 11 is a side elevation of the optical device withdrawn to inoperative position; and

Fig. 12 is a fragmentary detail taken on line 12--12 'of Fig. 3, and showing. the mounting of the optical device.

Referring now to the drawings, and particularly to Figs. l and 2, the numeral 10 designates 55 the supporting standard fora type of motion 1930. serial No. 436,141

(Cl. iss-16.2)

picture projector originally adapted solely for the projection of silent pictures, and which embodies a film movement head 11 and lamp house 12, an upper film magazine 13 mounted on top of head 11, and, located below head 11, a lower film magazine 14 within which is carried the usual frictionally driven take-up reel, indicated at 14a.

The lower frame part 15 of head 11 (see Fig. 1) originally rested on and was secured down to the frame plate 16 provided at the top of the lower magazine 14. To adapt the projector for the attachment of the sound reproducer provided by the present invention, member 15 and the parts above it are elevated a proper amount, when the reproducer unit, generally indicated by the numeral 20, is inserted between the head and the lower magazine. The main frame 21 of the reproducer unit then rests on the frame plate 16 above the lower magazine, and the frame part 15 of head 11 rests on the upper side of the main frame 21 of the reproducer unit, the whole assembly being secured together by means of screws 23 extending from the projector frame parts 15 and 16 into the main frame 21.

The original driving equipment for the type of silent projector here illustrated embodies a drive motor 25 and variable speed drive gear box 26, the drive pulley 26a of box 26 being drivingly connected by means of belt 27 (indicated in dotted lines) to a pulley 28 on the projector head. Pulley 28 drives a pinion 29 meshing with a gear 29a, which gear drives another pinion 29h meshing with a gear 29C, and gear 29e drives the mechanism of the projector head, not illustrated. In adapting the projector for operation with the sound reproducer unit, belt 27 is removed from pulley 28 and gear 29e is caused to be driven by the reproducer unit, as hereinafter to be described.l .The original. variable speed driving equipment is preferably retained on the projector, however, for a purpose which will appear later.

Referring now to Figs. 2 to 5 inclusive, and first to Fig. 3, the main frame 21 of the reproducer unit is provided with a forwardly extending vertical frame plate 30, upon which is mounted a constant-speed synchronous drive motor 31. Motor 3l is preferably mounted through the medium of rubber cushions 32 for the purpose of reducing the transmission of motor vibration to the frame parts of the apparatus.

The horizontal drive shaft 33 of motor 3l comprises a motor shaft 34 and gear shaft 35, coupled together by means of a sible coupling .pling thus serves as a" flexible universal joint,

'and aids in reducing the transmission of motor vibrationsinto the other parts of the apparatus.

Gear shaft 35 is journaled in bearings 40 carl ried nearl the ends of a horizontally cylindric casing part 41 of a housing 42 mounted upon the end of main frame 21.. Bearings 40, which surround reduced sections of gear shaft 35 and conne between themselves the full diameter section t of the shaft, are axially positioned between ,the

inner end of a cap 45 screw-threaded into the left hand end of case 41; as viewed in Fig. 5, and the inner end of a bushing 46 screw-threaded into the right-end of case 41. Shaft 45 is then axially ,movable for position by adjustment of cap 45 and bushing 46, as will be understood.

Between the pair of bearings 40, shaft 45 is provided with a worm 48 which mesheswith a worm wheel 49 mounted in housing 42, worm wheel 49 surrounding and hav'ing a slip-clutch connection with the end of a horizontal main drive shaft 50 journaled in main frame 21, as will hereinafter be more fully described.

As shown in Figure 4, housing 42 carries a bearing 54 for shaft 50, and has back of bearing 54 a tubular portion 55 loosely surrounding the shaft and taken within a bore 56 provided in the main frame. A thrust bearing 58 is provided for shaft 50 within bore 56 adjacent the end of tubular part 55, and bears against a collar 59 secured on the shaft.

A slip-clutch connection is provided between worm wheel 49 and shaft 50, as now to be described. Pinned fast to shaft 50 and extending through worm wheel 49 is a sleeve 60, which has adjacent the inner face of the worm wheel a ange or clutch-disk 61, and between disk 61 and worm wheel 49 is a fibre clutch-washer 62. Rotatably mounted on sleeve 60 at the other side of wormwheel 49 is an outer sleeve 63 which has a clutch-disk 64 adjacent the outer face of the worm wheel. and between 64 and worm wheel 49 is a fibre clutch-washer 65. The end of shaft 50 has a reduced threaded section 50a and screwed on section 50a is a nut 66v which confines between its head and clutch-disk 64 a shaft-encircling compression spring 67. Spring 67 is adjusted by means of nut 66 to bind the clutch assembly together with sufficient tightness to provide a driving connection between gear 49 and shaft 50 which will hold tightly at all normal loads to keep the machine up to speed, but which will permit a certain amount of slipping as the synchronous motor is started to allow the moving parts of the apparatus to be brought up to speed gradually without shock and jar, and further which will permit slipping in case any part of the machine or head should bind or the lm jam. Housing 42 is closed by a clutch cap 68, which is removed in case it is desired to adjust the compression of spring 67.

Shaft 50 is journaled near its center in a bushing 70 carried in a bore 71 provided in the main frame, and at its remaining end in an outside bearing 72 having a tubular portion 73 set into a bore 74 provided in the main frame. This shaft, which is thus supported throughout its length by three bearings 54, 70 and 72, has for additional stability a flywheel 75 secured between bearings 70 and 72 by means of set screws 76. A

When motor 31 is used as the initial drive. shaft 50 is utilized to drive the projector head mechanism, a sound record table for mechanical disk records, and also a sound sprocket for carrying the film past the sound aperture when soundyon-lm records are being run.

The mechanism for driving the projector head by means of shaft 50 will first be described. The drive of the projector head is accomplished from shaft 50 through ily wheel '75, with which is associated a clutch serving to drivingly connect the shaft 50 with a train of gears leading to the projector head mechanism. The clutch 78 embodied in this combination includes a'manually actuatable ring 79 mounted for axially slidable movement on a sleeve 80 set on shaft 50. Ring `79 has a pin 81 fixed therein parallel to shaft 50, one end of the pin being slidably taken within a hole 82 drilled in the end of flywheel 75, and the other end thereof being adapted to enter a registered hole 83 provided in a disk 84 loosely mounted on shaft 50. Due to'meeting disk 84, ring 79 cannot be moved far enough to the right, as viewed in Fig. 4, to remove pin 81 from the drill hole 82 in the y wheel, and it is thus evident that ring 79 turns constantly under all conditions with shaft 50. Assuming ring 79 to be in a position to the left of that illustrated, in which pin 81 is removed from hole 83, to lock shaft 50 to disk 84 the ring 79 is simply moved toward the right vand pin 81 allowed to find a hole 83 in the disk, when disk 84 will turn with shaft 50.

Loosely surrounding shaft 50 and adjacent disk 84 are a pinion 85 and pulley 86, the disk 84, pinion 85 and pulley 86 all being pinned together to form a single unit loosely mounted on shaft 50 and adapted to be locked by means of clutch 78 to turn with the shaft.

Pinion 85 meshes with a gear 88 carried by an adjustable gear bracket 89. Bracket 89 is mounted at its inner end for rotative movement on the bushing 70 of shaft 50, and is formed with a slot 90 circumferential with respect to shaft 50 through which passes a clamping screw 91 which threads into the wall of main frame 21 for the purpose of clamping the gear bracket in proper position. Journaled in the outer end of bracket 89 is a spindle 93, upon one end of which is a pinion 94 meshing with gear 88, and upon the other end of which is a pinion 95 which meshes with the drive gear 29e of the projector head (see Fig. l).

It will be recognized that due to the fact that bracket 89 is pivotally mounted upon shaft 50, gear 95 which is a part of my attachment, can be raised or lowered to mesh accurately with gear 29e of the projector head, and such adjusting movement will not interfere with the relation of gear 88 to pinion 85. The bracket 89 can thus be set by means of screw 91 at whatever position required for proper meshing of pinion 95 with gear 29e of the particular projector head utilized, and this adjustment can be lijf.)

s .nul

which then runs idle. In case it is desired to speed up or slow down projection to meet a designated schedule when running silent films, the synchronous motor drive mechanism is disconnected from the projector head by opening clutch '78, and the usual variable speed drive 25, 26 is then connected by simply slipping belt 27 over pulley 28.

The take-up reel within the lower magazine 14 was originally driven through its pulley 9 from a pulley 8 on theprojector head and a suitable connecting belt. Due to the interposing of the reproducer unit, however, pulley 8 is no longer available for this purpose, and the take-up reel is therefore now driven through its pulley, 8 from the pulley 86 and a connecting belt 97. It will be remembered that pulley 86 is secured together with pinion 85 and disk 84, and therefore when the apparatus is being driven by means Lof synchronous motor 31 with clutch 78 closed, the take-up reel is driven through pulley 86 from shaft 50 and the synchronous motor 31; but

` when the projector is being driven from the motor 25 and variable speed drive 25, 26, the take-up reel is driven in synchronism with the head from the drive gear 29c of the projector head back through gears 8, 95, 94, 88 and 85. It will thus be seen that the take-up reel is driven no matter which of the two drive means for the apparatus is being employed.

The mechanical-disk record table, indicated at 100, is driven from a worm 101 fast on the left hand end of shaft 50, as viewedin Fig. 4. Worm 101 is adapted to mesh with a worm wheel 102 fast on a vertical table-driving shaft 103, worm wheel 102 and shaft 103 being mounted in a housing 104 extending from the end plate 105 of main frame 21.

Housing 104 is formed with a cylindrical casing portion 106 which axially takes the end of shaft 50, and which has a sliding fit over an enlarged flange portion 107 provided about shaft bearing 72 for partial support of the housing. A vertical plate 108 at the end of housing portion 106 fits face to face against the end plate 105 of the main frame, and has a pair of slots 109 circumferential with respect to shaft 50, through which clamping screws 110 pass to thread into plate 105 for the purpose of clamping and supporting the housing in position. It will be seen that the housing 104, through which the record table is supported, is so mounted that by loosening screws 110 the housing can be rotated about shaft 50 through a small angle for the purpose of leveling the record table, after which the screws may be fastened down to clamp the housing into position. And it will be seen that since this adjustment is effected by rotation of the housing, and consequently of the worm wheel mounted therein, about the axis of shaft 50, the relation of worm 101 to -worm wheel 102 will not be disturbed.

This adjustment is important, as the projec tion rooms in different theatres are at different elevations and the whole projector is usually tilted to place the optical axis of the projector in line with the screen in a given installation, thus obviously necessitating a leveling adjustment for the record table.

The vertical table-shaft 103 extends downwardly below its driving worm wheel 102 through a cylindrical housing portion 113, and is mounted eccentrically in a pair of bearings 114 and 115 carried respectively at the top and bottom of a sleeve 11'7 rotatably mounted within said housing portion.

Worm wheel 102 and shaft 103 are vertically supported by the upper end of eccentric bearing 114, which bearing is itself vertically supported by means of a head flange 114a provided atits upper end and overhanging the horizontal surface 119 within the housing.

The lower eccentric bearing 115 extends downwardly and outside of housing portion 113 and has on its lower end a -knurled flange or hand piece 120 by which bearing 115 can be manually rotated. Rotation of bearing 115 in this manner causes rotation of sleeve 1,17, the other bearing 114, and the shaft 103; and due to the eccentric mounting of the shaft this rotation moves the shaft-around in a small circle, which causes' the worm wheel mounted thereon to be taken out of engagement with its driving worm 101 when the eccentric bearing has been rotated to a position 180 from that illustrated in the drawings, as will be readily understood. Thus, when either sound-on-film or silent pictures are being run the mechanical disk record equipment can be disconnected and stand stationary.

Applied to the section of shaft 103 extending above worm wheel 102 is a tubular member 125, the head of which is formed with an outwardly facing annular slot 126 into which are taken and secured the inner ends of radial arms 22, upon the outer ends of which the record table is supported. The preferred mounting for table 100 is completely described in my copending application entitled Nonvibratory support of record table, filed May 19, 1930, Ser. No. 453,574. The table mounting referred to is preferred due to its vibration absorbing character, although any other suitable table mounting may be substituted if desired. The record table 100 is preferably made of considerable weight for the purpose of reducing vibration.

The upper end of housing 104 carries a casting 128, which provides a supporting bracket 129 t, for the reproducer arm 130. The reproducer arm *130 carries the usual pick-up unit 131, and is mounted to swing over a mechanical disk record 132 carried by the record table 100, in the usual manner. The mounting 134 for the reproducer arm on its supporting bracket 129 is preferably of the type described in my copending application entitled ,"Nonvibratory mounting for reproducer arm, filed May 19, 1930, Ser. No. 453,575. This type of mounting is preferred due to its vibration absorbing character, although any other type of reproducer arm mounting may be substituted if desired.

The numeral 140 indicates the sprocket over which the nlm F passes as it leaves the projector head (see Figs. 1, 10 and 1l). From sprocket 140 the film passes downwardly and in front of a "sound sprocket 141 set on shaft 50, from where the film passes on down between rollers 142 to the take-up reel within magazines 14.

The sound-on-film reproducing devices are illustrated in Figs. 9 to 12 inclusive. The optical unit, designated generally at 145, embodies a light projecting element and a light sensitive element. The light projecting element includes a lens tube 146, a lamp house 14'7 hinged to the rear end of the lens tube, an incandescent lamp 148 mounted in the lamp house, a condenser lens 149 in front of lamp 148, a light-slit 150 adjacent lens 149,'an objective 151, frame plate 152 mounted at the forward end of the optical unit, an aperture plate 153 secured to frame plate 152 and a light aperture 153a provided in 'plates 152 and 153 on the optical axis of slit 150 and objective 151 (see Fig. 10 for the last described parts). The optical unit is of course so mounted that aperture 153a is in direct line with the sound track 154 at the edge of the lm.

This light projecting element is carried by a bracket-plate 155 secured to the main frame, as shown in Figs. 1 and 3, and is slidably mounted thereon to be movable toward and away from film r', as now to be described.

Plate 155 (see Fig. 12) is formed with a longitudinal horizontal way 156 which slidably takes base standards 157 extending laterally from the optical unit. The optical unit is resiliently held against bracket plate 155 by means of studs 159 which extend from thestandards through longitudinal slots 160 in plate 155, and around which are carried compression springs 161 confined between nuts 163 on the ends of the studs and wasliers 164 adjacent the bracket plate. The optical unit is thus movable between operative and inoperative positions, illustrated in Figs. 10 and 11 respectively.

The light sensitive element above referred to embodies a cell house 170, which is supported back of the film and opposite the optical unit by means of a U-shaped bracket 171 mounted on plate 155, as clearlyshown in Fig. 3. The light sensitive cell within the cell house is indicated at 172 in Fig. 10.

The arm 173 of bracket 171 supports at its upperv edge a resilient plate 174 which carries a tension pad 175 opposite aperture plate 152 of the op' tical unit, plate 174 being adapted to be bent backwardly to allow the parts to take the position of Fig. 10 when the optical unit is moved toward the lm, and then to cause the tension pad to exert pressure on the film, as will hereinafter be more fully explained.

The frame plate 152 at the forward end of the light projecting element is a part o f a frame 180 supporting two pairs of film rollers 181 and 182,

which are located at the top and bottom, respec- Y tively, of aperture plate 153. Frame 180 has a bracket portion 184 curving downwardly around sprocket 141 and carrying a pair of retaining rollers 185 outside of the film which are adapted to move the lm against the sprocket when the optical unit is in the position of Fig. 10. From rollers 185 bracket 184 curves around the lm and carries at the rear side thereof a pair of rollers 187 adapted to -hold the film off of sprocket 141 when the optical unit is in the inoperative position of Fig. 11.

Thus, when the optical unit is moved toward the operative position of Fig. 10, rollers 181 and 182 contact the film and move it against the tension pad 175, which is thereby moved forwardly due to bending of its supporting plate 174; while rollers 185 also contact the iilm and move it against the sound sprocket 141. The tension pad then acts, under the influence of resilient plate 174, to press the film against its aperture plate 153.

Tension pad 175, its resilient supporting plate 174, cell house bracket arm 173 and the end of cell house 170 are provided with apertures 189, 190, 191 and 192, respectively, which are all registered with the aperture 153a of the light prov jecting element when said element is moved to' its operative position of Fig. 10, to allow light rays projected from aperture 153a through the sound record on the film to enter the cell house and impinge upon the light sensitive cell 172 provided therein.

When the optical unit is moved from the position of Fig. 10 to the position of Fig. 11, rollers 187 contact the lm from its rear side and pull it oli of the sprocket 141, thereby allowing operation to be carried on Without threading said sprocket.

The complete operation of the apparatus will now be understood, but a brief recapitulation will here be given.

To set up conditions for synchronous sound reproduction with mechanical disk records, the knurled hand piece 120 of eccentric bushing 115 is turned until the table-driving worm wheel 102 meshes with the worm 101 on shaft 50, and clutch 78 is closed to drivingly connect shaft 50 with the projector head. Then, seeing that belt 27 is removed from pulley 28, and preferably that the light projecting element of the optical unit is- Withdrawn to its inoperative position with film F removed from sprocket 141, the needle of the pick-up unit may be located on the record on table 100, and motor 31 started.

In case it is then desired to run sound-on-lm records, the record table shaft is disconnected by rotation of handpiece 120 through 180, and the light projecting element of the optical unit is moved toward the film to the position of Figure 10, which operation threads the film over the sound sprocket.

If silent pictures are to be run, the projector head can if desired be driven through shaft 50 from the synchronous motor 31; or, in case a variable speed drive is desired, clutch 78 is opened to disconnect shaft 50 and motor 31 from the projector head, and belt 27 is then placed over pulley 110 28 to connect the variable speed drive 25, 26. Since shaft 50 will in the latter situation remain stationary, it is essential during such operation that the light projecting element of the optical unit be withdrawn to its inoperative position of 115 Fig. 11 to hold the lm off of the then stationary sprocket 141. i

Attention is called to the simplicity and compactness characterizing the general layout of the whole attachment, which features are conducive 120 not only to stability, freedom from vibration and ease of maintenance and operation, but also to relatively low initial cost of manufacture.

It will be understood the drawings and description are to be considered merely as illustrative 125 of and not restrictive on the broader claims appended hereto, for various changes in design, structure and arrangement may be made without departing from the spirit and scope of said claims.

Iclaim:

-1. In combination with a motion picture projector having a film movement head, a take-up reel, and a disconnectible driving means for the film movement head; a frame, a main driving shaft journaled in said frame, a motor driving 135 said shaft, disconnectible driving means between said shaft and said film movement head, an optical sound record reproducing unit mounted on' the frame, a sprocket on the driving shaft for moving the film past the optical unit, said optical unit including an element movable toward and away from the film, and means carried by said movable element for moving the film into and out of engagement with the said sprocket.

2. In combination with a motion picture projector having a film movement head, a take-up reel, and a disconnectible driving means for the lrn movement head; a frame, a main driving shaft journaled in said frame, a motor driving said shaft, disconnectible driving means between 150 said shaft and said nlm movement head, a lm driving sprocket on the driving shaft, an optical sound record reproducing unit mounted on the frame in proximity to the driving shaft, said optical unit including an element movable on the frame and adapted to contact the film when moved to operative position, and means carried by said movable element for holding the film out of engagement with said film driving sprocket when withdrawn to inoperative position.

3. In combination with a motion picture projector having a film movement head,'a take-up reel, and a disconnectible driving means for the film movement head; a frame, a main driving shaft journaled in said frame, an independent motor driving said shaft, disconnectible driving means between said driving shaft and said lm movement head, a record table mounted for rotation in the frame and driven from the main driving shaft, a film driving sprocket on the driving shaft, an optical sound record reproducing unit mounted on the frame in proximity to the driving shaft, said optical unit including an element movable on the frame and adapted to contact the film when moved to operative position, and means carried by said movable element for retaining the film on the sprocket when said element is in operative position, and for holding the lm out of engagement with the sprocket when said element is withdrawn to inoperative position.

4. In combination with a motion picture projector having a film movement head; a frame, a main driving shaft journaled in said frame, an independent motor driving said lshaft, driving means between said driving shaft and said film movement head, a record table mounted on the frame and driven from the main driving shaft, a film driving sprocket on the driving shaft, an optical sound record reproducing unit mounted on the frame in proximity to the driving shaft, said optical unit including an element movable on the frame and adapted to contact the lm when moved to operative position, and means carried by said movable element for retaining the film on the sprocket when said element is in operative position, and for holding the film out of engagement with the sprocket when said element is withdrawn to inoperative position.

5. A sound reproducer attachment for a motion picture projector having a film movement head, driving gears therefor, and film magazines; that embodies a frame adapted to fit between the film movement head and one of the magazines of the projector, a main driving shaft horizontally journaled in the frame laterally of the projector. a horizontal shaft journaled in the frame at right angles to said main driving shaft and geared at its rear end to one end of the said main driving shaft. a motor mounted on the frame and driving the last mentioned shaft, a vertical shaft journaled in the frame and geared to the opposite end of the main driving shaft, a record table mounted on said vertical shaft, an optical sound record reproducing unit mounted on the frame, a sprocket on the main driving shaft adapted to move the film through the optical unit, and driving gears carried by said frame and adapted to interconnect the main driving shaft and the driving gears of the film movement head.

6. A sound reproducer attachment for a motion picture projector having a film movement head, driving gears therefor, a lower film magazine below the nlm movement head, and a takeup reel in said film magazine; that embodies a frame adapted to t between the film movement head and the lower magazine, a main driving shaft horizontally journaled in the frame laterally of the projector, a horizontal shaft journaled in the frame at right angles to the main driving shaft and geared at its rear end to one end of the main driving shaft, a motor mounted on the frame and driving the horizontal shaft, a vertical shaft journaled in the frame and geared to the opposite end of the main driving shaft, a record table mounted on the vertical shaft, an optical sound record reproducing unit mounted on the frame, a sprocket on the main driving shaft adapted to move the nlm through the optical unit, a pinion mounted for relative rotation on the main driving shaft, a clutch carried by said shaft and adapted to lock the pinion to the shaft, a pulley for the drive of the take-up reel mounted for relative rotation on said shaft and driven by the pinion, and driving gears carried by the frame and adapted to interconnect the said pinion with the driving gears of the film movement head.

ROBERT C. BURT. 

